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December 19, 2014

Homework Help: pyhsic question for count iblis

Posted by pyhsiclover on Wednesday, May 22, 2013 at 2:11am.

PLEASE GIVE THE ANSWER,I ALREADY INPUT TO YOUR FORMULA AND IT IS FALSE...
Is your answer 0.57?


A 15 kg, 1m wide door which has frictionless hinges is closed but unlocked. A 400 g ball hits the exact middle of the door at a velocity of 35 m/s and bounces off elastically, thereby causing the door to slowly swing open. How long in seconds does it take for the door to fully open (rotate 90 degrees)?

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